Q&A - P4 Math

[tianzhu]

concerned1970:

Hi Tianzhu! Seriously, I've great difficulty in understanding in solving this sum.
How to tell the difference of chicken wings is dropped by 7 for every increase of a girl? How did you get 120 and why was it divided by 7? Ty!

Hi

Please have another look at the example given in the link and follow same steps for your question.

Assume there were 30 boys and each boy ate 4 chicken wings, you’ll have (30*4) or 120 chicken wings.

Next consider an increase of 1 girl, so for 29 boys and 1 girl, you’ll have a difference of (29*4) - 3 or 113 chicken wings.

For an increase of 1 girl the difference is (120-113) or 7 chicken wings.

Best wishes

[Donnie]

thanks.

[sianonehalf]

Need help!! A farmer has 80 chickens and goats. There are 250 legs. How many chickens are there? (Use assuming all method). Anyone??

[corneyAmber]

sianonehalf:

Need help!! A farmer has 80 chickens and goats. There are 250 legs. How many chickens are there? (Use assuming all method). Anyone??

Assume all 80 chickens.
80x2 = 160
250-160 = 90
4-2 = 2 (goat has 4 legs but chickens have 2 legs)

90/2 = 45 -> no. of goats.

Hence chickens is (80-45)=35.

By ksi junior

[applepie]

Need help on this question please…


The total mass of 5 packets of flour and 4 packets of rice is 490 kg. Each packet of flour has a mass twice that of a packet of rice. What is the mass of each packet of flour ?

Thanks.

[tianzhu]

applepie:

Need help on this question please...


The total mass of 5 packets of flour and 4 packets of rice is 490 kg. Each packet of flour has a mass twice that of a packet of rice. What is the mass of each packet of flour ?

Thanks.

Hi

One way to solve it.

Rice ----- 1 unit
Flour ----- 2 units

Mass for 5 packets of flour ------ (5*2) ------ 10 units
Mass for 4 packets of rice ----- 4 units

14 units ----- 490
1 unit ----- 35

2 units ----- 70 (the mass of each packet of flour)

Best wishes

[corneyAmber]

applepie:

Need help on this question please...


The total mass of 5 packets of flour and 4 packets of rice is 490 kg. Each packet of flour has a mass twice that of a packet of rice. What is the mass of each packet of flour ?

Thanks.

Let u be the mass of rice.
mass of flour is 2u.
5(2u) + 4(u) -> 490
14 u-> 490
u-> 35
2u -> 70
Mass of each packet of flour is 70kg

By ksi junior

[applepie]

Got it, thanks tian zhu and ksi…!

[concerned1970]

Hi, pls help to solve with a model diagram if possible. Ty!


1) Fatimah has 40 coins. Some of the coins are 50-cent coins and the rest are
20-cent coins. The total value is $16.10 How many 50-cent coins does Fatimah
have?

2) In a long jump competition, Paul jumped 0.16m further than Royston while
Shawn jumped 0.24m less than Paul. If the total distance jumped by the three
boys was 3.44m, how far did each boy jump?

[corneyAmber]

concerned1970:

Hi, pls help to solve with a model diagram if possible. Ty!


1) Fatimah has 40 coins. Some of the coins are 50-cent coins and the rest are 20-cent coins. The total value is $16.10 How many 50-cent coins does Fatimah have?

2) In a long jump competition, Paul jumped 0.16m further than Royston while Shawn jumped 0.24m less than Paul. If the total distance jumped by the three boys was 3.44m, how far did each boy jump?

1. Assume all 40 are 20-cent coins.
40 x 0.20 = 8
16.10-8.00 = 8.10
0.50 - 0.20 = 0.30

8.10/0.30 = 27

There are 27 50-cent coins.

Check: 27 x 0.50 = 13.50, 13x0.20 = 2.60 Total = 13.50+2.60 = 16.10

2.

P (__u___)(16)
R (__u___)
S (__u+16-24)

u+16 + u + u+16-24 -> 344
3u = 336
u = 112

Paul jumped (112+16)= 128 cm= 1.28m
Royston jumped 112cm = 1.12m
Shawn jumped 112-8 = 104cm = 1.04m


by ksi junior